645116631154 has 16 divisors (see below), whose sum is σ = 976671803520. Its totient is φ = 319572663120.

The previous prime is 645116631149. The next prime is 645116631191. The reversal of 645116631154 is 451136611546.

It is a happy number.

645116631154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645116631154.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3227709 + ... + 3421744.

It is an arithmetic number, because the mean of its divisors is an integer number (61041987720).

Almost surely, 2^645116631154 is an apocalyptic number.

645116631154 is a deficient number, since it is larger than the sum of its proper divisors (331555172366).

645116631154 is a wasteful number, since it uses less digits than its factorization.

645116631154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6649905.

The product of its digits is 259200, while the sum is 43.

The spelling of 645116631154 in words is "six hundred forty-five billion, one hundred sixteen million, six hundred thirty-one thousand, one hundred fifty-four".